An automatic curling and stamping device for packaging metal barrel lids

Abstract

The present invention relates to the technical field of metal bucket lid production, and specifically to an automatic curling and stamping device for packaging metal bucket lids, which includes a base. A U-shaped bracket is fixedly installed on the upper end surface of the base, and a support seat located below the horizontal section of the U-shaped bracket is fixedly installed on the upper end surface of the base. A loading mechanism for loading metal bucket lids is jointly provided on the support seat and the U-shaped bracket. An integrated operation model of extrusion, alignment, and guidance is adopted to quickly complete the automatic curling and stamping of metal bucket lids. Through multi-stage operations and adaptive expansion, combined with the cooperation of extrusion fixation and expansion correction, a pre-bending guide is provided for the metal bucket lid during the curling and stamping process, thereby optimizing the material flow path and distribution. At the same time, the position of the metal bucket lid during the forming process is ensured to be stable, gradually releasing the material stress, reducing the risk of cracking or deformation, improving the forming accuracy and dimensional stability, and achieving a more uniform curling effect, so as to ensure the perfect fit between the metal bucket lid and the bucket lid body and improve the sealing effect.

Description

Technical Field

[0001] The invention relates to the technical field of metal barrel cover production, in particular to an automatic curling and punching device for packaging metal barrel covers. Background Art

[0002] The packaging metal drum cover is an important component used to seal and protect the contents of the metal drum. It is usually used for packaging and transportation in the fields of industry, chemical industry, food, etc. to prevent the contents of the sealed drum from spilling and protect its contents from external contamination. In order to make the metal drum cover more firmly and safely closed on the drum body, it is necessary to perform a curling and stamping process on the metal drum cover during the production process (see Figure 7 ), in order to increase the structural rigidity of the barrel cover, making it less likely to deform when subjected to pressure or impact, and eliminate its sharp edges to reduce the risk of cuts or scratches during operation.

[0003] At present, there are the following disadvantages when curling and stamping the metal barrel cover for packaging: 1. When curling and stamping the metal barrel cover, workers are usually required to place the metal barrel cover in the lower mold first, and then use the stamping equipment to directly perform one-time curling and stamping. The one-time curling and stamping will cause excessive stress concentration in certain areas of the metal barrel cover material, causing the metal barrel cover to crack or deform after stamping, and the one-time stamping will cause uneven material thickness distribution at the curling, thereby affecting the product strength and sealing performance; 2. In the process of placing the metal barrel cover in the corresponding position, workers are required to manually adjust the position of the metal barrel cover, and the introduction of manual errors will cause differences in the gap between the metal barrel cover and the lower mold, resulting in excessive stretching of the material in some places where the gap is too large, and excessive gaps will cause material accumulation or wrinkles, making the unevenly curled metal barrel cover unable to fit perfectly with the barrel body, thereby reducing the sealing effect, and inconsistent curling of the metal barrel cover will cause differences in the structural strength of different parts, affecting the overall performance of the metal barrel cover. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an automatic curling and punching device for packaging metal barrel covers, which is achieved by the following specific technical means: an automatic curling and punching device for packaging metal barrel covers, comprising a base, a 冂-shaped bracket is fixedly installed on the upper end surface of the base, a support seat located below the horizontal section of the 冂-shaped bracket is fixedly installed on the upper end surface of the base, and a bearing mechanism for bearing the metal barrel cover is jointly arranged on the support seat and the 冂-shaped bracket; the bearing mechanism comprises a supporting portion arranged on the 冂-shaped bracket, and a connecting portion for elastically supporting the supporting portion is arranged on the support seat.

[0005] A driving mechanism is provided on the U-shaped bracket, and an execution mechanism is provided on the driving mechanism for cooperating with the bearing mechanism to perform curling and stamping operations on the metal bucket lid in multiple segments; the driving mechanism includes a driving part provided on the U-shaped bracket to provide power for the execution mechanism, and a limiting part is provided on the supporting part to provide vertical limit for the execution mechanism during operation.

[0006] The execution mechanism includes a curling and pressing part provided on the driving part, a flat pressing part is provided on the curling and pressing part for squeezing and fixing the inside of the metal bucket lid in cooperation with the curling and stamping operation, a position correcting part is provided on the flat pressing part for expanding and correcting the position of the metal bucket lid in cooperation with it, and a pre-bending part is also provided on the curling and pressing part for pre-bending and guiding the inside of the metal bucket lid before curling in cooperation with the curling and stamping operation.

[0007] As a preferred technical solution of the present invention, the supporting part includes a vertical slide rail, a first slider and a supporting circular plate. The upper end surface of the base is fixedly installed with vertical slide rails that are symmetrically arranged front and back between the vertical sections of the U-shaped bracket. The first slider is slidably installed in the vertical slide rail, and a supporting circular plate located directly above the supporting seat is fixedly installed together between the front and back symmetric first sliders.

[0008] As a preferred technical solution of the present invention, the connecting part includes a first sliding rod and a first spring. The upper end surface of the supporting seat is fixedly installed with a number of first sliding rods in a circumferential array. The lower end surface of the supporting circular plate is provided with first sliding holes corresponding to the first sliding rods one by one. A first spring sleeved on the first sliding rod is fixedly installed between the supporting circular plate and the supporting seat.

[0009] As a preferred technical solution of the present invention, the driving part includes a hydraulic cylinder and a supporting cross plate. The hydraulic cylinder is fixedly installed on the horizontal section of the U-shaped bracket, and the telescopic end of the hydraulic cylinder is fixedly installed with a supporting cross plate located below the horizontal section of the U-shaped bracket.

[0010] As a preferred technical solution of the present invention, the limiting part includes a limiting column. The upper end surface of the supporting circular plate is fixedly installed with front and back symmetric limiting columns, and the upper ends of the front and back symmetric limiting columns slidably penetrate through the supporting cross plate.

[0011] As a preferred technical solution of the present invention, the curling and pressing part includes a lower die, an upper die, an upper arc groove and a lower arc groove. A ring-shaped lower die is fixedly installed at the center of the upper end surface of the supporting circular plate, and an upper die located directly above the lower die is fixedly installed on the lower end surface of the supporting cross plate. A positioning groove is opened at the center of the upper die. An upper arc groove is opened at the upper end of the inner ring wall of the lower die, and an upper arc groove matching the lower arc groove is opened on the upper die. The upper arc groove and the lower arc groove are combined to form a columnar cavity with an annular cross section.

[0012] As a preferred technical solution of the present invention, the flat pressing part includes a spring sliding rod and a circular pressing plate. A plurality of spring sliding rods are fixedly installed on the lower end surface of the upper die in a circumferential array manner, and a circular pressing plate located directly below the upper die is fixedly installed together at the lower ends of the plurality of spring sliding rods.

[0013] As a preferred technical solution of the present invention, the alignment part includes a groove, an alignment rod, and a pressing roller. A plurality of grooves are formed on the outer ring wall of the circular pressing plate in a circumferential array manner. An alignment rod is rotatably installed in the groove through a torsion spring rod, and a pressing roller is fixedly installed at the end of the alignment rod away from the circular pressing plate.

[0014] As a preferred technical solution of the present invention, the pre-bending part includes a limiting slideway, a second slider, an expansion rod, a pressing arc block, and a spindle-shaped block. A plurality of limiting slideways are penetrated through the outer ring wall of the upper die in a circumferential array manner and are located below the upper arc groove. A second slider is slidably installed in the limiting slideway through a second spring. An expansion rod is fixedly installed on the second slider, and pressing arc blocks are fixedly installed at the mutually remote ends of the expansion rods. A spindle-shaped block located in the alignment groove is fixedly installed at the center of the upper end surface of the circular pressing plate.

[0015] As a preferred technical solution of the present invention, rubber layers are coated on both the pressing roller and the pressing arc block, and the end of the pressing roller away from the circular pressing plate is arc-shaped.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. For this automatic curling and stamping device for packaging metal bucket lids, through the mutual cooperation of the provided bearing mechanism, driving mechanism, and executing mechanism, an integrated operation model of extrusion, alignment, and guidance is adopted to quickly complete the automatic curling and stamping of metal bucket lids. Through multi-stage operations and adaptive expansion, combined with the cooperation of extrusion fixation and expansion correction, pre-bending guidance is provided for the metal bucket lid during the curling and stamping process, thereby optimizing the material flow path and distribution. At the same time, it ensures the stable position of the metal bucket lid during the forming process, gradually releases the material stress, reduces stress concentration, lowers the risk of cracking or deformation, improves the forming accuracy and dimensional stability, and achieves a more uniform curling effect, thus ensuring the perfect fit between the metal bucket lid and the bucket lid body and improving the sealing effect.

[0017] 2. For this automatic curling and stamping device for packaging metal bucket lids, through the mutual cooperation of the provided driving mechanism and executing mechanism, during the curling and stamping process, pre-bending guidance before curling is implemented on the inside of the metal bucket lid through adaptive expansion, which can better control the material movement direction, make the curling more uniform, and the pre-bending can disperse the material stress, reduce stress concentration, and reduce the risk of cracking or deformation. At the same time, it can avoid the springback of the metal bucket lid and ensure the dimensional stability after forming.

[0018] 3. The automatic curling and stamping device for the packaging metal barrel lid, through the set execution mechanism, during the process of curling and stamping the metal barrel lid, squeezes and fixes the metal barrel lid and expands and corrects it. The squeezing and fixing can ensure that the barrel lid maintains a stable position during the stamping process, while the expansion and correction can optimize the material distribution, ensure more uniform material flow during the curling process, eliminate the initial deformation in the material, reduce the risk of wrinkles appearing during the curling process, and improve the overall structural strength of the metal barrel lid.

[0019] 4. The automatic curling and stamping device for the packaging metal barrel lid, through the mutual cooperation of the set bearing mechanism and execution mechanism, uses multi-stage operations to complete the curling and stamping of the metal barrel lid. The multi-stage operations can make the metal barrel lid gradually take shape, thereby reducing the error of one-time forming, improving the overall forming accuracy, and the staged forming can gradually release the stress in the material, reducing the risk of stress concentration and material cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structure schematic diagram of the present invention.

[0021] Figure 2 It is a three-dimensional structure schematic diagram when the present invention is working.

[0022] Figure 3 It is a three-dimensional structure schematic diagram of the bearing mechanism of the present invention.

[0023] Figure 4 It is a three-dimensional structure schematic diagram of the driving mechanism and the execution mechanism of the present invention.

[0024] Figure 5 It is a sectional three-dimensional structure schematic diagram of the present invention.

[0025] Figure 6 For Figure 5 The enlarged structure schematic diagram at A in

[0026] Figure 7 It is a process change diagram for curling and stamping the edge of the packaging metal barrel lid from a vertical state to a curled state.

[0027] In the figure: 1. Base; 2. U-shaped bracket; 3. Support seat; 4. Loading mechanism; 41. Support part; 411. Vertical slide rail; 412. First slider; 413. Support circular plate; 42. Connection part; 421. First slide bar; 422. First spring; 5. Driving mechanism; 51. Driving part; 511. Hydraulic cylinder; 512. Support cross plate; 52. Limiting part; 521. Limiting column; 6. Execution mechanism; 61. Rolling and pressing part; 611. Lower die; 612. Upper die; 613. Upper arc groove; 614. Lower arc groove; 62. Flat pressing part; 621. Spring slide bar; 622. Circular pressing plate; 63. Alignment part; 631. Groove; 632. Alignment rod; 633. Pressure roller; 64. Pre-bending part; 641. Limiting slideway; 642. Second slider; 643. Expansion rod; 644. Extrusion arc block; 645. Spindle-shaped block. Detailed implementation manners

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figure 1 , an automatic curling and stamping device for packaging metal bucket lids, including a base 1. A U-shaped bracket 2 is fixedly installed on the upper end surface of the base 1. A support seat 3 is fixedly installed on the upper end surface of the base 1 and is located below the horizontal section of the U-shaped bracket 2. A loading mechanism 4 for loading metal bucket lids is jointly provided on the support seat 3 and the U-shaped bracket 2; the loading mechanism 4 includes a support part 41 arranged on the U-shaped bracket 2, and a connection part 42 for elastically supporting the support part 41 is arranged on the support seat 3.

[0030] Please refer to Figure 1 , a driving mechanism 5 is arranged on the U-shaped bracket 2, and an execution mechanism 6 for cooperating with the loading mechanism 4 to perform curling and stamping operations on the metal bucket lid in multiple sections is arranged on the driving mechanism 5.

[0031] Please refer to Figure 1 , the driving mechanism 5 includes a driving part 51 arranged on the U-shaped bracket 2 and providing power for the execution mechanism 6, and a limiting part 52 for providing vertical limitation for the execution mechanism 6 during the operation of the execution mechanism 6 is arranged on the support part 41.

[0032] Please refer to Figure 1 and Figure 4, the actuating mechanism 6 includes a rolling and pressing part 61 arranged on the driving part 51. A flat pressing part 62 for squeezing and fixing the inside of the metal barrel cover during the curling stamping operation is arranged on the rolling and pressing part 61. A position correcting part 63 for expanding and correcting the position of the metal barrel cover is arranged on the flat pressing part 62. A pre-bending part 64 for pre-bending and guiding the inside of the metal barrel cover before curling during the curling stamping operation is also arranged on the rolling and pressing part 61.

[0033] Please refer to Figure 1 , Figure 2 and Figure 3 , the supporting part 41 includes a vertical sliding rail 411, a first slider 412 and a supporting circular plate 413. The vertical sliding rails 411 which are symmetrically arranged front and back and are located between the vertical sections of the U-shaped bracket 2 are fixedly installed on the upper end surface of the base 1. The first slider 412 is slidably installed in the vertical sliding rail 411. The supporting circular plate 413 which is located directly above the supporting seat 3 is fixedly installed between the symmetrically arranged first sliders 412 front and back.

[0034] Please refer to Figure 1 , Figure 2 and Figure 3 , the connecting part 42 includes a first sliding rod 421 and a first spring 422. A plurality of first sliding rods 421 are fixedly installed on the upper end surface of the supporting seat 3 in a circumferential array manner. First sliding holes corresponding to the first sliding rods 421 one by one are opened on the lower end surface of the supporting circular plate 413. The first spring 422 sleeved on the first sliding rod 421 is fixedly installed between the supporting circular plate 413 and the supporting seat 3.

[0035] Please refer to Figure 1 , Figure 2 and Figure 4 , the driving part 51 includes a hydraulic cylinder 511 and a supporting cross plate 512. The hydraulic cylinder 511 is fixedly installed on the horizontal section of the U-shaped bracket 2. The telescopic end of the hydraulic cylinder 511 is fixedly installed with a supporting cross plate 512 located below the horizontal section of the U-shaped bracket 2.

[0036] Please refer to Figure 1 , Figure 2 and Figure 3 , the limiting part 52 includes a limiting column 521. The limiting columns 521 which are symmetrically arranged front and back are fixedly installed on the upper end surface of the supporting circular plate 413. The upper ends of the symmetrically arranged limiting columns 521 slidably penetrate through the supporting cross plate 512.

[0037] Please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5, the curling and pressing part 61 includes a lower mold 611, an upper mold 612, an upper arc groove 613 and a lower arc groove 614. A ring-shaped lower mold 611 is fixedly installed at the center of the upper end surface of the supporting circular plate 413. An upper mold 612 located directly above the lower mold 611 is fixedly installed on the lower end surface of the supporting cross plate 512. A positioning groove is provided at the center of the inner part of the upper mold 612. A circle of lower arc grooves 614 is provided at the upper end of the inner wall of the lower mold 611. An upper arc groove 613 matching the lower arc groove 614 is provided on the upper mold 612. The upper arc groove 613 and the lower arc groove 614 are combined to form a columnar cavity with an annular cross-section.

[0038] During specific operation, when curling and stamping a metal bucket lid is required, first place the metal bucket lid in the lower mold 611, and then start the hydraulic cylinder 511 to drive the upper mold 612 to descend through the supporting cross plate 512. During this process, the limiting column 521 limits the supporting cross plate 512 in the vertical direction, so as to ensure the horizontality of the docking position between the upper mold 612 and the lower mold 611.

[0039] Subsequently, the upper mold 612 continues to descend. At this time, the upper mold 612 will first push the metal bucket lid, the lower mold 611 and the supporting circular plate 413 downward through the upper arc groove 613. The first spring 422 between the supporting circular plate 413 and the supporting seat 3 is compressed, and the vertical slide rail 411 and the first slider 412 will limit the descending direction of the supporting circular plate 413 until the supporting circular plate 413 can no longer descend.

[0040] At this time, when the upper mold 612 continues to descend, the flat pressing part 62 will squeeze and fix the metal bucket lid, the alignment part 63 will cooperate to perform the first expansion and alignment on the metal bucket lid, and the pre-bending part 64 will extrude the vertical part of the metal bucket lid outward synchronously during the descending process of the upper mold 612, so as to perform the second expansion on the metal bucket lid to correct its position, and pre-bend and guide the vertical part of the metal bucket lid, so that the upper end of the vertical part of the metal bucket lid is pushed to the highest point inside the upper arc groove 613. The inner wall of the upper arc groove 613 will guide the upper end of the vertical part of the metal bucket lid to continue curling the vertical part of the metal bucket lid.

[0041] Subsequently, continue to lower the upper mold 612 until the upper mold 612 fits with the lower mold 611. During this process, the vertical part of the metal bucket lid will move along the upper arc groove 613 into the lower arc groove 614, and when the upper mold 612 fits with the lower mold 611, the curling and stamping of the metal bucket lid is completed. In this way, the curling and stamping of the metal bucket lid is completed by multi-stage operations, so that the metal bucket lid is gradually formed, the overall forming accuracy is improved, and the stress in the material is gradually released, reducing the risk of stress concentration and material cracking.

[0042] Please refer to Figure 1 and Figure 4, the flat pressing part 62 includes a spring slide rod 621 and a circular pressing plate 622. A plurality of spring slide rods 621 are fixedly installed on the lower end surface of the upper die 612 in a circumferential array manner, and a circular pressing plate 622 located directly below the upper die 612 is fixedly installed together at the lower ends of the plurality of spring slide rods 621.

[0043] Please refer to Figure 1 , Figure 4 and Figure 6 , the alignment part 63 includes a groove 631, an alignment rod 632 and a pressing roller 633. A plurality of grooves 631 are formed on the outer ring wall of the circular pressing plate 622 in a circumferential array manner. An alignment rod 632 is rotatably installed in the groove 631 through a torsion spring rod arranged therein, and a pressing roller 633 is fixedly installed at one end of the alignment rod 632 away from the circular pressing plate 622.

[0044] During specific operation, when the upper die 612 descends, at this time, the circular pressing plate 622 first contacts the lower end surface inside the metal barrel lid under the action of the spring slide rod 621, thereby always pressing the metal barrel lid in the lower die 611. And the surrounding pressing rollers 633 will rotate outward with the torsion spring rod as the center point until they stop rotating. At this time, the expanded alignment rod 632 will perform a second expansion and correction on the inside of the metal barrel lid to ensure that the gap between the metal barrel lid and the lower die 611 is uniform, thereby optimizing the material distribution.

[0045] And when the supporting circular plate 413 cannot descend further, at this time, the descent of the upper die 612 will cause the circular pressing plate 622 to continue to squeeze and fix the metal barrel lid, thereby ensuring that the lid maintains a stable position during the stamping process.

[0046] Please refer to Figure 4 and Figure 6 , the pre-bending part 64 includes a limit slideway 641, a second slider 642, an expansion rod 643, a pressing arc block 644 and a spindle-shaped block 645. A plurality of limit slideways 641 located below the upper arc groove 613 are penetrated on the outer ring wall of the upper die 612 in a circumferential array manner. A second slider 642 is slidably installed in the limit slideway 641 through a second spring arranged therein. An expansion rod 643 is fixedly installed on the second slider 642. Pressing arc blocks 644 are fixedly installed at the mutually remote ends of the expansion rods 643. A spindle-shaped block 645 located in the alignment groove is fixedly installed at the center of the upper end surface of the circular pressing plate 622. Rubber layers are coated on both the pressing roller 633 and the pressing arc block 644, and one end of the pressing roller 633 away from the circular pressing plate 622 is arc-shaped.

[0047] During specific operation, when the supporting circular plate 413 can no longer descend, the upper die 612 continues to descend. At this time, the distance between the upper die 612 and the circular pressing plate 622 decreases. At this time, under the action of the second spring, all the surrounding expansion rods 643 approach the spindle-shaped block 645. During the process of the continuous decrease in the distance between the upper die 612 and the circular pressing plate 622, the convex part of the spindle-shaped block 645 will simultaneously extrude the surrounding expansion rods 643 outwards. And the expansion rods 643 expand the upper end of the vertical part of the metal barrel lid outwards by extruding the extrusion arc block 644. Thus, during the curling stamping process, pre-bending guidance before curling is implemented on the metal barrel lid, which can better control the material movement direction and make the curling more uniform.

[0048] When the upper die 612 descends to the lowest position, at this time, the expansion rods 643 are located at the lower vertical position of the spindle-shaped block 645, so that the surrounding expansion rods 643 return under the action of the second spring and no longer extrude the vertical part of the metal barrel lid. After the curling stamping is completed, reverse-start the hydraulic cylinder 511 and after all parts are reset, take out the completed metal barrel lid, and then the curling stamping of the next metal barrel lid can be carried out.

[0049] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic curling and punching device for packaging metal barrel covers, comprising a base, characterized in that: A U-shaped bracket is fixedly installed on the upper end surface of the base, and a support seat is fixedly installed on the upper end surface of the base and located below the horizontal section of the U-shaped bracket. A bearing mechanism for bearing the metal bucket lid is jointly arranged on the support seat and the U-shaped bracket; The bearing mechanism includes a support part arranged on the U-shaped bracket, and a connecting part for elastically supporting the support part is arranged on the support seat; A driving mechanism is arranged on the U-shaped bracket, and an execution mechanism for cooperating with the bearing mechanism to perform curling and stamping operations on the metal bucket lid in multiple sections is arranged on the driving mechanism; The driving mechanism includes a driving part arranged on the U-shaped bracket to provide power for the execution mechanism, and a limiting part for providing vertical limit for the execution mechanism during the operation of the execution mechanism is arranged on the support part; The execution mechanism includes a rolling and pressing part arranged on the driving part, a flat pressing part for squeezing and fixing the inside of the metal bucket lid in cooperation with the curling and stamping operation is arranged on the rolling and pressing part, a position correcting part for expanding and correcting the position of the metal bucket lid in cooperation with the flat pressing part is arranged on the flat pressing part, and a pre-bending part for pre-bending and guiding the inside of the metal bucket lid before curling in cooperation with the curling and stamping operation is also arranged on the rolling and pressing part; The rolling and pressing part includes a lower die, an upper die, an upper arc groove and a lower arc groove. The pre-bending part includes a limiting slideway. A plurality of limiting slideways are贯穿 through the outer ring wall of the upper die in a circumferential array and located below the upper arc groove. A second slider is slidably installed in the limiting slideway through a second spring arranged therein. An expansion rod is fixedly installed on the second slider. Extrusion arc blocks are fixedly installed at the mutually remote ends of the expansion rods. A conical block located in the alignment groove is fixedly installed at the center of the upper end surface of the circular pressing plate; During the downward movement of the lower die, the pre-bending part synchronously extrudes the vertical part of the metal bucket lid outwards to perform a second expansion and correction on the metal bucket lid.

2. The automatic curling and punching device for packaging metal barrel cover according to claim 1, characterized in that: The support part includes a vertical slide rail, a first slider and a support circular plate. Vertical slide rails that are symmetrically arranged front and back and located between the vertical sections of the U-shaped bracket are fixedly installed on the upper end surface of the base. A first slider is slidably installed in the vertical slide rail. A support circular plate located directly above the support seat is jointly fixedly installed between the symmetrically arranged first sliders front and back.

3. The automatic curling and punching device for packaging metal barrel cover according to claim 2 is characterized in that: The connecting part includes a first slide rod and a first spring. A plurality of first slide rods are fixedly installed on the upper end surface of the support seat in a circumferential array. First slide holes corresponding to the first slide rods one by one are opened on the lower end surface of the support circular plate. A first spring sleeved on the first slide rod is fixedly installed between the support circular plate and the support seat.

4. The automatic curling and punching device for packaging metal barrel cover according to claim 1, characterized in that: The driving part includes a hydraulic cylinder and a support cross plate. A hydraulic cylinder is fixedly installed on the horizontal section of the U-shaped bracket. The telescopic end of the hydraulic cylinder is fixedly installed with a support cross plate located below the horizontal section of the U-shaped bracket.

5. The automatic curling and punching device for packaging metal barrel cover according to claim 2 is characterized in that: The limiting part includes a limiting column. Limiting columns that are symmetrically arranged front and back are fixedly installed on the upper end surface of the support circular plate. The upper ends of the symmetrically arranged limiting columns slidably penetrate through the support cross plate.

6. The automatic curling and punching device for packaging metal barrel lid according to claim 2, characterized in that: A ring-shaped lower die is fixedly installed at the center of the upper end surface of the support circular plate, and an upper die located directly above the lower die is fixedly installed on the lower end surface of the support cross plate. A alignment groove is opened at the center of the inside of the upper die. An upper arc groove is opened at the upper end of the inner ring wall of the lower die. An upper arc groove that cooperates with the lower arc groove is opened on the upper die. The upper arc groove and the lower arc groove are combined to form a columnar cavity with an annular cross section.

7. The automatic curling and punching device for packaging metal barrel cover according to claim 6, characterized in that: The flat pressing part includes a spring slide bar and a circular pressure plate. The lower end surface of the upper mold is fixedly mounted with a plurality of spring slide bars in a circular array. The lower ends of the plurality of spring slide bars are jointly fixedly mounted with a circular pressure plate located directly below the upper mold.

8. The automatic curling and punching device for packaging metal barrel cover according to claim 7 is characterized in that: The correction part includes a groove, a correction rod and a pressure roller. A plurality of grooves are opened on the outer ring wall of the circular pressure plate in a circumferential array. The correction rod is rotatably installed in the groove through a torsion spring rod. The pressure roller is fixedly installed at one end of the correction rod away from the circular pressure plate.

9. The automatic curling and punching device for packaging metal barrel lid according to claim 8, characterized in that: The pressing roller and the extrusion arc block are both covered with a rubber layer, and the end of the pressing roller away from the circular pressure plate is arc-shaped.

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